Replaceable blade cartridge for a centrifugal type food slicer

ABSTRACT

The present invention discloses a replaceable blade cartridge and a compatible assembly for holding the cartridge wherein an old blade cartridge is slidably removed from the holding assembly and a new blade is slidably inserted into the holding assembly. Specifically, a replaceable blade cartridge for use in a compatible cutting head assembly of a centrifugal type slicer is disclosed.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to centrifugal type slicingapparatus. More specifically the present invention relates to areplaceable blade cartridge for use in a centrifugal type slicer,especially for slicing potatoes, wherein one cartridge may be slidablyremoved from a cutting head assembly and a new cartridge slidablyinserted into the cutting head assembly.

2. Description of Related Art

The commercial process of processing vegetables, nuts, and fruitrequires sized reduction of large volumes of food stuffs. The presentinvention will be described in terms of slicing potatoes to make potatochips. However, as those skilled in the art will appreciate, the presentinvention can be employed for a wide variety of uses such as shreddingor producing a variety of geometrical shapes. Various machines have beendeveloped to accomplish the potato slicing.

One such machine is a centrifugal type slicer, such as the UrschellModel CC Slicer, manufactured by Urschell Laboratories, Inc. In thisslicer an impeller with inwardly extending partitions is rotated andpotatoes are placed in the impeller. The centrifugal force created bythe rotating impeller forces the potatoes outwardly against thepartitions and a cutting head surrounding the impeller. The cutting headis generally cylindrical shaped and includes a series of related cuttingblades spaced around the cutting head and separated by curved supportingwalls, commonly referred to as shoes.

A typical cutting head includes eight shoes and blades and is fittedonto the slicer by a series of locating pins. Each shoe holds a cuttingblade and has a pivoting pin that is inserted into a corresponding holeon a retaining ring. The shoes are then rotatable about this pivotingpin and are attached to the ring by a screw.

In use a blade becomes dull and needs frequent replacement. Therefore,each typical head requires that eight blades be replaced many timesduring operation and typically there are multiple heads feedingsubsequent processing units. To replace the blades, the head must belifted from the slicer and turned over so that the head rests on theretaining ring. Next, bolts on a blade clamp are loosened or removed toallow the blade to be removed from the blade holder. After a new bladeis inserted and the blade clamp tightened to hold the blade in placeeach shoe must be adjusted relative to its two adjacent shoes. Thisadjustment is necessary in order to maintain a constant predeterminedslice thickness.

The adjustment is made by first loosening the screw holding the shoe tothe ring to allow the shoe to be pivoted. Next, a setting gauge measuresthe gap between the new blade and the adjacent shoe. This gap determinesthe thickness of each potato slice and ideally should be maintained atuniform spacing. This gap is not always set to the same thicknessbecause different density potatoes need to be set at different gapthicknesses. If the potatoes are "heavy", i.e. contain less water, thegap needs to be narrower than for less heavy potatoes because the sliceswill shrink less than "lighter" slices. Also, the operator must allowfor a fluctuation in the gap thickness when he tightens down each shoe.A skilled operator may have to make up to 10 gap adjustments for aneight blade cutting head, before the proper gap tolerances are achieved,and those less skilled may have to make more.

Therefore, it can be seen that it is time consuming and difficult to setthe gaps in the cutting head. It can take a skilled operator as much asten minutes to change blades and adjust the gap thickness on a singlecutting head.

Due to the pivoting feature of the shoes there is a certain amount ofmovement and give in the shoes. This results in uncontrollablevariability in the slice thickness of the potatoes. Wear at the junctionof the pivoting pin and the hole in the retaining ring results in theshoes being movable within the cutting head assembly and introduces aneven greater amount of variability in slice thickness. When a potatocontacts a shoe during slicing the potato may cause one or more of thecutting shoes to move resulting in a potato slice which is not within anacceptable range of thickness.

Another problem is encountered because the shoes are connected to onlyone retaining ring on one side of the shoe. When the pivot junctionbegins to wear this may result in a non-uniform gap thickness from theretaining ring to a point opposite the ring. This is highly undesirablein a commercial setting where a uniform potato slice is necessary tomaintain a high level of quality control in the end product--potatochips.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide areplaceable blade cartridge wherein the cartridge can be replacedwithout the use of any tools.

It is another object to provide a cartridge that is compatible with acutting head assembly such that a predetermined gap thickness ismaintained from one cartridge to the next without the need for any gapadjustment.

It is still another object of the present invention to provide a varietyof cartridges wherein a different gap thickness is achieved with eachcartridge.

Another object of the present invention is to decrease the bladereplacement time and difficulty from the present state of the art.

To achieve these and other objects a cutting head assembly for use witha centrifugal type slicer is provided comprising a plurality of shoespresenting a leading and a trailing portion. A blade cartridge holdingassembly is attached to the trailing portion of one shoe and the leadingportion of an adjacent shoe and a blade cartridge is slidably engagedwithin the holding assembly such that a predetermined gap is formedbetween the blade cartridge and the trailing portion of an adjacentshoe. Such construction allows a blade to be replaced simply by slidablyremoving an old blade cartridge and slidably inserting a new bladecartridge.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features of the present invention will be more fullydisclosed in the following DESCRIPTION OF THE PREFERRED EMBODIMENT inwhich like numerals represent like elements and in which:

FIG. 1 is a perspective view of the cutting edge portion of thepreferred blade cartridge in accordance with the present invention;

FIG. 2 is a perspective view of the blade cartridge from the rear;

FIG. 3 is a cross-sectional view of the blade cartridge taken along line3--3 of FIG. 2;

FIG. 4 is a cross-sectional view of the blade cartridge taken along line4--4 of FIG. 2;

FIG. 5 is a perspective view of a cutting head assembly in accordancewith the present invention;

FIG. 6 is a perspective view of a retaining cap from the inner side;

FIG. 7 is a perspective view of the blade cartridge retaining capshowing the impeller side;

FIG. 8 is a top view of the blade cartridge retaining cap taken alongline 8--8 of FIG. 6;

FIG. 9 is a perspective view of a head block illustrating the outsideportion;

FIG. 10 is a perspective view of the head block illustrating theimpeller side;

FIG. 11 is a top view of the head block taken along line 11--11 of FIG.9;

FIG. 12 is a cross-sectional view of the head block taken along line12--12 of FIG. 9;

FIG. 13 is a top view of the cutting head assembly;

FIG. 14 is a fragmentary view of FIG. 13 detailing the blade cartridgeinserted in the head block assembly;

FIG. 14A is a fragmentary cross-sectional view of a wave-shaped bladecartridge held between a head block and retaining cap;

FIG. 14B is a cross-sectional view of the wave-shape cartridge takenalong line 14--14 of FIG. 14A;

FIG. 15 is a perspective view of a shoe in accordance with the presentinvention;

FIG. 16 is a front view of the shoe;

FIG. 17 is a cross-sectional view of the shoe taken along line 17--17 ofFIG. 16;

FIG. 18 is an impeller-side elevation of an integral blade block andsand gate in accordance with an alternate embodiment of the presentinvention;

FIG. 19 is a side elevation of FIG. 18;

FIG. 20 is an outer-side elevation of the integral blade block and sandgate; and

FIG. 21 is a cross-section of the integral blade block and sand gatetaken along line 21--21 of FIG. 18.

FIG. 22 is a fragmentary cross-sectional view of another alternateembodiment of the present invention, including a blade and compatiblehead block assembly.

FIGS. 23-25 are cross-sectional views of other alternate embodiments ofinventive blades in accordance with the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

FIGS. 1 and 2 show a replaceable blade cartridge 10 in accordance withthe present invention. The cartridge 10 includes a blade 12, a casing14, and a pull tab 16. The casing 14 and pull tab 16 are preferablyformed of molded plastic and substantially surround the blade 12 exceptfor a cutting edge portion 18. Holes 20 and notched portion 22 areformed during molding of the casing and have no utility in the use ofcartridge 10.

FIG. 3 is a cross-sectional view of the pull tab 16 area of cartridge 10taken along line 3--3 of FIG. 2. The pull tab 16 has a cross-sectionalshape that prevents cartridge 10 from sliding completely within its headblock assembly (described below). FIG. 4 is a cross-sectional view ofthe main body of cartridge 10 taken along line 4--4 of FIG. 2. Thecasing 14 has a cross-sectional shape which is slidably engaged withinthe head block assembly. Casing 14 forms two notches 24 and 26 withnotch 26 formed closer to cutting edge portion 18 than notch 24. Notch24 is on the impeller side of cartridge 10. Casing 14 also includes aranged portion 28 that functions as a key such that cartridge 10 can beinserted into the head block assembly in only one direction. Flangedportion 28 also prevents the casing 14 from slipping out of the headblock assembly. The portion of casing 14 between the notches 24 and 26and cutting edge 18 needs to be substantial enough to prevent blade 12from bending an unacceptable amount when slicing potatoes or other foodstuffs.

FIG. 5 illustrates a complete cutting head assembly 30 in accordancewith the present invention. The head assembly 30 is preferably used witha centrifugal type slicer such as the Urschell Model CC referred toabove. The unitary head assembly 30 shown in FIG. 5 includes cartridge10, upper and lower support rings 32, shoes 34, and head blockassemblies 36 rigidly assembled to each other. Each assembly 36 includesa head block 38 and a retaining cap 40 forming a blade holding device.Support rings 32 are pinned and rigidly bolted to each head block 38 atholes 39. As can be seen, the support rings 32 are preferably 16-sidedfor an eight blade cutting head assembly as shown. Each shoe 34 ispinned and rigidly bolted to a head block 38 at opposing ends.Therefore, it can be seen that there are no rotating or moveable partsin the inventive cutting head assembly 30, which provides the greatadvantage of eliminating the need for adjusting the gap between eachshoe as required heretofore.

Retaining cap 40, shown in FIGS. 6-8, is bolted onto head block 38 toform a longitudinal cartridge slot that slidably engages casing 14 andholds cartridge 10 securely in place. Retaining cap 40 has a somewhatwedge shaped cross-sectional area, as shown in FIG. 8, and presents asurface 42 that is slightly concaved to match the curve of shoes 34.Surface 42 faces the impeller of the slicer used with cutting headassembly 30. Cap 40 also includes a notched portion 44 such that whencap 40 is attached to head block 38, it will abut notch 24 of cartridge10, shown in FIG. 4. Three bolt holes 46 and two pin holes 48 allow cap40 to be accurately positioned and attached to head block 38.

Head block 38, shown in FIGS. 9-12, includes a base 50, a top portion52, a side portion 54 and a cartridge holding portion 56 including aretention finger 58. A slot 60 is formed between portions 54 and 56through which the potato slices pass. As best seen in FIGS. 9 and 10,orifices 62 and 63 are provided in base 50 and top 52 which mate withorifices 37 and 39 in rings 32 to allow head blocks 38 to be pinned andbolted to rings 32. Orifices 64 and 65 mate with holes in a trailingportion of shoes 34 to allow a shoe to be pinned and bolted to each headblock 38. Holding portion 56 includes countersunk bolt holes 66 and pinholes 68 that mate with orifices 46 and 48, respectively, of retainingcap 40. When cap 40 is pinned and bolted to holding portion 56, anotched area 69 will hold a leading portion of a shoe 34.

In this manner a leading portion of one shoe 34 and a trailing portionof an adjacent shoe 34 are held by each head block 38 to form a completehead assembly 30, as shown in FIG. 13. An arrow 70 indicates therotational direction of a standard impeller of the centrifugal typeslicer that forces the potatoes into contact with each stationary bladecartridge 10 to produce potato slices that pass through slot 60.

It is desirable to make the cutting head assembly 30 as versatile aspossible and toward this end it would be advantageous to be able toproduce a variety of slice thicknesses. This is because, for variousreasons, one may want a thicker or thinner slice than previouslyproduced or another vegetable requiring a different slice thickness maybe processed with the same assembly 30. In order to easily accomplishthis task the blades 12 need to be adjusted quickly and accurately tochange the gap thickness defined by blade 12 and sand gate 78. With thepresent invention the gap thickness is changed by simply inserting adifferent cartridge 10 into the block head assembly 36 that creates theacceptable gap. A predetermined gap thickness, and therefore the potatoslice thickness, can be changed by molding blade 12 closer to one sideof casing 14 than another. For example, if blade 12 were positionedwithin casing 14 closer to notch 24 this would result in a greater slicethickness. In this way it would be easy to form casings 14 in a colorcode scheme so that an operator could easily identify which cartridge 10would produce a given slice thickness. To replace a cartridge 10 anoperator simply grasps pull tab 16 and pulls the cartridge from slot 72and inserts a new cartridge. There are no tools needed nor is there aneed for any adjustments to be made to the cutting head assembly 30.

FIG. 14 is a fragmentary view of a portion of FIG. 13 detailing a headblock assembly 36. As can be seen head block 38 is disposed between ring32 and shoes 34. Retaining cap 40 is attached to head block 38 to form aslot 72 into which cartridge 10 is fitted as shown. A trailing portionof a shoe 34 is attached to head block 38 by aligning holes 74 and 76with holes 64 and 65, respectively. Preferably, the trailing portion ofeach shoe includes a sand gate 78 the purpose of which is to allow sand,dirt, and other debris on the potatoes to fall into a plurality of wells79 in sand gate 78. This significantly reduces damage to the blade 12and head block assembly 36. As those skilled in the art are aware thesand gate 78 may be integral to the shoe 34, as shown in FIG. 14, or itcan be a separate part and removably attached to shoe 34 (not shown). Asseen in FIGS. 14, 15, 16, and 17, a leading portion of each shoe 34 isformed with a tooth 80 that is held between head block 38 and retainingcap 40. Shoe 34 preferably includes a curved inner surface 82 that facestoward the slicer impeller. The curve of surface 82 facilitates forcinga potato against the shoe during slicing operations to provideconsistent slice thicknesses.

FIGS. 14A and 14B illustrate a preferred embodiment for a wave-shapedblade cartridge 84. Cartridge 84 is essentially the same as cartridge 10above except a blade 86 has a wave-shaped profile, as shown in FIG. 14B.Blade 86 is substantially surrounded by a molded casing 88. Thecross-sectional shape of casing 88 is similar to casing 14. The majordifference is that cartridge 84 must necessarily be wider to accommodatethe wave-shaped blade 86 compared to cartridge 10. Cartridge 84 is heldin place between a retaining cap 40' and a retention finger 58'similarly to cartridge 10. As those skilled in the art will appreciate,a shoe (not shown) used with cartridge 84 should, preferably, be formedwith ridges generally conforming to the wave-shape of blade 86. This isto maintain the potato in alignment during slicing so that uniformlyridged potato slices are produced. As those skilled in the art willappreciate, the same slice assembly can be used to produce shreddedslices or other cut thicknesses of vegetables, nuts, and fruit.

FIGS. 18-21 disclose another embodiment of the present invention. Acartridge with an integral blade holder and sand gate is shown generallyat 90. This embodiment is similar to the invention described above inthat no time consuming and difficult gap adjustments are necessary; butthis embodiment differs from that above in that conventional blades areused and must be clamped in place with a clamp and bolts. The cartridge90 is adapted to be attached to a conventional cutting head assembly toeliminate the need for any gap thickness adjustments. This isaccomplished because a predetermined gap 92 is provided between theblade holder portion 94 and sand gate portion 96. This ensures that eachpotato slice will always be of a predetermined thickness. Cartridge 90functions in all other material respects as a conventional blade holder.Cartridge 90 is connected to a leading portion of a conventional shoe(not shown) through bolt holes 98 and to a trailing portion of anadjacent shoe through bolt holes 100. A conventional blade 102 is thenplaced on inclined surface 104 over locating pins 106 and held in placeby a clamp 108 and bolts 110 that are received through holes 112. Thenas the slicer impeller is rotated potato slices pass through gap 92. Asbest seen in FIG. 21, cartridge 90 preferably presents a curved surface114 that faces the impeller to promote more consistent potato slices.

Still another embodiment of the present invention is disclosed in FIGS.22-25. A blade 116, shown in FIG. 22 in cross-section, is slidably heldwithin a slot 118 defined by retaining cap 120 and a head block 122.This configuration is similar to that described above in connection withcartridge 10 except that the blade 116 itself provides the keying, showngenerally at 124, to hold the blade in slot 118. Blade 116 has agenerally V-shaped keyed area 124 but many other keying configurationscould be used. Some other embodiments are shown in FIGS. 23-25. Theseinclude a blade 126 in FIG. 23, presenting a notch 128, that wouldslidably fit within a slot defined by a compatible retaining cap andhead block (not shown). Similarly, the blade 130 and it's rounded keyarea 132, shown in FIG. 24, and the blade 134 and it's L-shaped key area136 would slidably fit within retaining caps and head blocks constructedto accommodate the particular keying scheme used. These are but a fewexamples of possible keying configurations that could be employed tohold blades in place during use and to ensure their proper insertioninto their respective cutting head assemblies.

Thus there has been shown a novel blade cartridge and compatible headblock assembly that allows an old blade cartridge to be slidably removedand a new blade slidably inserted into a slot in the compatible headblock assembly. The novel cutting head assembly disclosed herein has nomoving or pivoting parts that would allow the slice gap thickness tomaterially change. There is no need for tools or for any adjustments tobe made to the disclosed novel cutting head assembly as required byconventional assemblies. Also, disclosed is an alternate cartridge thatpresents an integral blade holder and sand gate to provide a constantnonvariable gap. This alternate cartridge is adaptable to conventionalcutting head assemblies and uses conventional blades.

As those skilled in the art will appreciate, it is noted thatsubstitutions may be made for the preferred embodiment and equivalentsemployed herein without departing from the scope of the presentinvention as recited in the claims. For example, alternativecross-sectional shapes could be employed for the blade cartridge. Also,various other means could be employed to hold the blade cartridge inplace.

We claim:
 1. A cutting head assembly for use with a centrifugal typeslicer comprising:upper and lower annular support rings; a plurality ofspaced head block assemblies having upper and lower ends attached to theupper and lower support rings, respectively; a longitudinal cartridgeslot of predetermined cross-sectional shape in each of said head blockassemblies, said longitudinal slot extending generally in a longitudinaldirection from said upper end to said lower end in each of said headblock assemblies; a plurality of shoe elements respectively disposedbetween said plurality of head block assemblies, each shoe elementpresenting a leading portion and a trailing portion, said leadingportion of each shoe element being attached to a first one of said headblock assemblies and the trailing portion of the same shoe element beingattached to a second one of said head block assemblies which is adjacentthe first head block assembly; and a blade and integrally formed casingforming a blade cartridge having substantially the same predeterminedcross-sectional shape as said longitudinal cartridge slot and beingslidably disposed within said longitudinal cartridge slot in each headblock assembly such that a predetermined gap is formed between the bladeand the trailing portion of an adjacent shoe element, said bladecartridge being slidable in said longitudinal direction and positionedsolely by sliding the blade cartridge into the longitudinal cartridgeslot.
 2. The cutting head assembly of claim 1 wherein each shoe elementpresents structure defining an inner curved surface for promotingcontact with a potato to be sliced.
 3. The cutting head assembly ofclaim 1 wherein each shoe element includes a sand gate located adjacentthe trailing portion such that a gap is formed between the sand gate andthe blade.
 4. The cutting head assembly of claim 1 wherein the blade insaid blade cartridge has a straight cutting edge.
 5. The cutting headassembly of claim 1 wherein the blade in said blade cartridge has awave-shaped cutting edge.
 6. The cutting head assembly of claim 1wherein the casing of said blade cartridge is formed of molded plastic.7. The cutting head assembly of claim 1 wherein each of said head blockassemblies further includes a retaining cap attached to a assembly headblock thereby forming said cartridge slot which receives the bladecartridge therein.